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af5cf536bc
IF(..., CAST(longtext AS UNSIGNED), signed_val)
(was: LEFT JOIN on inline view crashes server)
Select from a LONGTEXT column wrapped with an expression
like "IF(..., CAST(longtext_column AS UNSIGNED), smth_signed)"
failed an assertion or crashed the server. IFNULL function was
affected too.
LONGTEXT column item has a maximum length of 32^2-1 bytes,
at the same time this is a maximum possible length of any
MySQL item. CAST(longtext_column AS UNSIGNED) returns some
unsigned numeric result of length 32^2-1, so the result of
IF/IFNULL function of this number and some other signed number
will have text length of (32^2-1)+1=32^2 (one byte for the
minus sign) - there is integer overflow, and the length is
equal to zero. That caused assert/crash.
CAST AS UNSIGNED function has been modified to limit maximal
length of resulting number to 67 (maximal length of DECIMAL
and two characters for minus sign and dot).
mysql-test/r/func_if.result:
Added test case for bug #40761.
mysql-test/t/func_if.test:
Added test case for bug #40761.
sql/item_func.h:
Bug #40761: Assert on sum function on
IF(..., CAST(longtext AS UNSIGNED), signed_val)
CAST AS UNSIGNED function has been modified to limit maximal
length of resulting number to 67 (maximal length of DECIMAL
and two characters for minus sign and dot).
167 lines
4.2 KiB
Text
167 lines
4.2 KiB
Text
#
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# Init section
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#
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--disable_warnings
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drop table if exists t1;
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--enable_warnings
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#
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# Simple IF tests
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#
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select IF(0,"ERROR","this"),IF(1,"is","ERROR"),IF(NULL,"ERROR","a"),IF(1,2,3)|0,IF(1,2.0,3.0)+0 ;
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#
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# Test of IF and case-sensitiveness
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#
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CREATE TABLE t1 (st varchar(255) NOT NULL, u int(11) NOT NULL) ENGINE=MyISAM;
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INSERT INTO t1 VALUES ('a',1),('A',1),('aa',1),('AA',1),('a',1),('aaa',0),('BBB',0);
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select if(1,st,st) s from t1 order by s;
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select if(u=1,st,st) s from t1 order by s;
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select if(u=1,binary st,st) s from t1 order by s;
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select if(u=1,st,binary st) s from t1 where st like "%a%" order by s;
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explain extended select if(u=1,st,binary st) s from t1 where st like "%a%" order by s;
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#
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# NULLIF test
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#
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select nullif(u, 1) from t1;
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explain extended select nullif(u, 1) from t1;
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drop table t1;
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select nullif(1,'test');
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#
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# Bug 2629
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#
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select NULLIF(NULL,NULL), NULLIF(NULL,1), NULLIF(NULL,1.0), NULLIF(NULL,"test");
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select NULLIF(1,NULL), NULLIF(1.0, NULL), NULLIF("test", NULL);
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#
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# Problem with IF()
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#
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create table t1 (num double(12,2));
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insert into t1 values (144.54);
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select sum(if(num is null,0.00,num)) from t1;
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drop table t1;
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create table t1 (x int, y int);
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insert into t1 values (0,6),(10,16),(20,26),(30,10),(40,46),(50,56);
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select min(if(y -x > 5,y,NULL)), max(if(y - x > 5,y,NULL)) from t1;
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drop table t1;
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#
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# BUG#3987
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#
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create table t1 (a int);
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insert t1 values (1),(2);
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select if(1>2,a,avg(a)) from t1;
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drop table t1;
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#
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# Bug #5595 NULLIF() IS NULL returns false if NULLIF() returns NULL
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#
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SELECT NULLIF(5,5) IS NULL, NULLIF(5,5) IS NOT NULL;
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#
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# Bug #9669 Ordering on IF function with FROM_UNIXTIME function fails
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#
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CREATE TABLE `t1` (
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`id` int(11) NOT NULL ,
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`date` int(10) default NULL,
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`text` varchar(32) NOT NULL
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);
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INSERT INTO t1 VALUES (1,1110000000,'Day 1'),(2,1111000000,'Day 2'),(3,1112000000,'Day 3');
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SELECT id, IF(date IS NULL, '-', FROM_UNIXTIME(date, '%d-%m-%Y')) AS date_ord, text FROM t1 ORDER BY date_ord ASC;
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SELECT id, IF(date IS NULL, '-', FROM_UNIXTIME(date, '%d-%m-%Y')) AS date_ord, text FROM t1 ORDER BY date_ord DESC;
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DROP TABLE t1;
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#
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# Test for bug #11142: evaluation of NULLIF when the first argument is NULL
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#
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CREATE TABLE t1 (a CHAR(10));
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INSERT INTO t1 VALUES ('aaa'), (NULL), (''), ('bbb');
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SELECT a, NULLIF(a,'') FROM t1;
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SELECT a, NULLIF(a,'') FROM t1 WHERE NULLIF(a,'') IS NULL;
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DROP TABLE t1;
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# End of 4.1 tests
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#
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# Bug #16272 IF function with decimal args can produce wrong result
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#
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create table t1 (f1 int, f2 int);
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insert into t1 values(1,1),(0,0);
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select f1, f2, if(f1, 40.0, 5.00) from t1 group by f1 order by f2;
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drop table t1;
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#
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# Bug#24532 (The return data type of IS TRUE is different from similar
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# operations)
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#
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# IF(x, unsigned, unsigned) should be unsigned.
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#
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select if(0, 18446744073709551610, 18446744073709551610);
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#
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# Bug #37662: nested if() inside sum() is parsed in exponential time
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#
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CREATE TABLE t1(a DECIMAL(10,3));
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# check : should be fast. more than few secs means failure.
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SELECT t1.a,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,
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IF((ROUND(t1.a,2)=1), 2,0)))))))))))))))))))))))))))))) + 1
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FROM t1;
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DROP TABLE t1;
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#
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# Bug #40761: Assert on sum func on IF(..., CAST(longtext AS UNSIGNED), signed)
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# (was: LEFT JOIN on inline view crashes server)
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#
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CREATE TABLE t1 (c LONGTEXT);
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INSERT INTO t1 VALUES(1), (2), (3), (4), ('12345678901234567890');
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SELECT * FROM (SELECT MAX(IF(1, CAST(c AS UNSIGNED), 0)) FROM t1) AS te;
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SELECT * FROM (SELECT MAX(IFNULL(CAST(c AS UNSIGNED), 0)) FROM t1) AS te;
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DROP TABLE t1;
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--echo End of 5.0 tests
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